.x-listbox
{   
	overflow:auto;
    background:white;
    line-height:18px;
    position:relative; /* for calculating scroll offsets */
    zoom:1;
    overflow:auto;	
}
.x-listbox-item{
    font:normal 12px tahoma, arial, helvetica, sans-serif;
    padding:2px;
    border:1px solid #fff;
    white-space: nowrap;
    height:18px;
}

.x-listbox-selected
{	
	border:1px dotted #a3bae9 !important;
    background:#DFE8F6;
}